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(No Model.) 2 SheetsSheet 1 L. G. H. MENSING. ELECTRIC ARC LAMP.

N0.'537,696. Patented Apr. 16, 1895.

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(No Model.) 2 Sheets-Sheet 2. L. 0. H. MENSING.

ELEUTRIG ARC LAMP. No. 537,696. PatentedApr. 1 1895.

UNllTED STATES PATENT EErcE.

LOUIS CARL HENRY MENSING, OF LONDON, ENGLAND.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent NO. 537,696, dated April16, 1895.

Application filed October 29,1894. Serial No. 527,340. (No model.)Patented in England January 1, 1894, N0. 67.

To all whom it may concern.-

Be it known that I, LOUIS CARL HENRY MENSING, a subject of the Queen ofGreat Britain, and aresident of 89 Worship Street, London, England, haveinvented certain new and useful Improvements in and Connected with ArcLamps, (patented in Great Britain, No. 67, dated January 1, 1894,) ofwhich the following is a specification.

This invention relates to automatic carbon feeding mechanism for arelamps and consists in the construction and combination of parts embracedin such mechanism, as hereinafter described and claimed.

My invention will be fully understood upon reference to the accompanyingsheet of drawings, in which-- Figure l is a part side elevation of anarc lamp as constructed according to my invention. Fig. 2 is a frontelevation of the same.

Fig. 3 is a plan, while Figs. 4, 5, 6, 7 and 8' are detail views of someof the parts. Fig. 9 is a partly sectional View illustrating thesolenoids and the adjusting supports for their cores.

Between the base plate A and top plate B, I arrange the standard orframe 0, O, secured thereto by the nuts D,D,and uponthis frame orstandard 0, O, is pivoted at E a lever or pendulum or swing frame Fhaving two arms G, G, for carrying the cores H, I, of a series and shuntwound coil J, K, respectively and between said frame F at a givendistance from the point of suspension of the lever F a double groovecord pulley M and brake wheel N are arranged in the slotted bearings Pfor easy insertion into and removal therefrom.

The brake wheel N is recessed upon one side as at Fig. 6, and has a pawlQ and spring R for engaging the ratchet teeth S formed on one side ofthe cord pulley M, so that when the brake pulley N is fitted upon thesleeve T of the cord pulley M with the pawl Q entering the teeth S saidratchet wheel S is completely inclosed.

The cord pulley M is hollowed for the reception of a coiled band or tapeU, one end V of same being attached to the inside periphery of thepulley M, and the other end W to the arbor X which having square ends Yand fitting similarly shaped bearing P in the frame F is prevented fromturning, whereby the coil band or tape U is wound up when the pulley Mis rotated by the lowering of the top carbon carrier A.

A flexible copper cord or tape Z has one of its ends fixed into one ofthe grooves of the pulley M and wrapped around same for the other end tobe fixed to the top carbon carrier A.

The top carbon carrier A is arranged to slide up and down the guide rodsB, B, by gravity, a lump 0 being formed or attached to same to act as aweight to turn the cord pulley M in opposition to the internallyarranged coil band or tape which being of a comparatively great lengthrelatively to the circumferential travel of the pulley M offerspractically no greater resistance to the gravity fall of the carboncarrier at the end of its stroke than it does in the beginning, it beingjust sufficient in all cases to rotate the wheel M in the oppositedirection to windand take up the slack 0f the flexible connection Z whenthe carrier A is lifted for the insertion of a fresh carbon. This isvery important, as by this means there is no tendency for the arc tolengthen as the carbon carrier descends to feed the carbons, theresistance to the brake band hereinafter described being always the samethroughout the total range of feed, whereby an absolutely steady andreliable light is maintained.

The brake wheel N is encircled preferably by a fine silver wire D oneend being suitably retained in hollow set screw E for ad justment by thenut F in the end of the frame F. A lever G is fulcrumed at H to anextension or horn I of the pen pendulum or frame F, the short end of thelatter having a stud J to which the other end of the beforementionedwire D is fastened.

The long end of the lever G is attached at K to a radial link L pivotedto the standard 0 by a set screw M. A slot N in the end of the lever Gallows of a certain amount of freedom of action to said lever when thependulum or frame F is moved outward by the attraction of the seriessolenoid core.

The series wound solenoid J under the action of the current tends todraw down the core H and move the pendulum outward be yond the verticalcenter and thereby cause the lever G to draw the wire D to grip thebrake wheel N to prevent same from turning under the weight of thecarrier A. Such outward radial motion of the pendulum or frame F also byits upward motion as indicated by the are I of a circle lifts by itsleverage the flexible cord Z to draw the carbons apart and widen the arcand increase the resistance, whereby a portion of the current willtraverse the high resistance solenoid K, the core I of which projectsbelow so that it is lifted upward by the solenoid K in opposition to thedownward pull of the series coil J upon the core H.

It is to be particularly noticed as it constitutes an important featureof my invention that the outward radial movement of the pendulum orframe F under the action of the series coil J and its core II attachedto the arm G materially increases the effective pull of the weightedcarbon carrier upon the flexible cord Z, which pull augments inincreasing ratio as the pendulum or frame F is moved farther beyond thecenter of gravity of the said pendulum or frame F, the wheels M and Nthus serving to proportionally assist the pull of the shunt woundsolenoid K in its opposition to the pull of the series coil J, theweight of the said frame and divided double wheels with the carboncarrier acting as a balance agaist the pull of the current in thesolenoid, whereby I am enabled to dispense with dashpots, and the lampis rendered so sensitive in action that the feeding of the arc isindistinguishable to the eye.

The cores H, I, can be regulated as to their length by the screws andnuts QQQ], and the movement of the pendulum or frame Fcan be limited bythe set screws R making contact with the obstruction S.

As the pull upon the shunt coil core I increases with theincreasing'resistance in the are due to the consumption of the carbons,the pendulum or frame F is moved assisted by its own weight to thecenter, and the lever G is lifted by the rise of the radiallink L toloosen the grip of the wire D, and allow the brake wheel N by the weightof the carrier turningthe cord pulley M, the teeth S of which engage thepawl Q on the wheel N beforementioned, to turn and thus let out the cordZ to feed the carbon gradually down until a reaction takes place toagain cause the lever G to brake the Wheel N and arrest further feedingof the carbon, the engagement of the ratchet teeth S with the pawl Qpreventing any further rotation of the cord pulley M.

The current is led to the lamp and distributed from the terminals T, T.

From the foregoing it will be seen that the wheels M and N move togetherin one direction under the weight of the carbon carrier when the grip ofthe brake is released, but the wheel M is free to rotate in the oppositedirection under the tension of the internal coiled band or tape when thecarbon carrier is lifted.

hen the lamp is required to burn unifocally the cord is not attached tothe divided wheel but is passed over same and down the carrier guides tothe bottom carbon holder.

What I claim, and desire to secure by Letters Patent, is

1. In an arc lamp, the combination with the upper carbon carrier, of aswing frame or open pendulum F having pivotally supported therein adouble or divided wheel composed of the grooved cord pulley M and thebrake wheel N connected by pawl and ratchet mechanism, the differentialsolenoid coils LII, having their cores II, I, supported from arms ofsaid swing frame or pendulum, a lever Gr carried by said frame andconnected to a band D on the brake wheel, a cord Z connecting the pulleyM with the fixed carbon carrier, and a coiled band or tape U inclosed insaid pulley and having one end attached thereto and its other endsecured to a fixed arbor, substantially as described.

2. In an arc lamp, the combination with the upper carbon carrier, ofaswing frame or pendulum F carrying a double or divided wheel composed ofthe pulley M and the brake wheel N connected by pawl and ratchetmechanism, the cord Z'connecting the pulley M and carbon carrier, thebrake band D on the wheel N, the lever G connected to said band and tothe swing frame, series and shunt wound solenoids having their cores II,I, supported by arms of the swing frame, and the coiled tape U in thepulley M, the said brake wheel and pulley being adapted to rotatetogether in one direction by the pull of the carbon carrier when thegrip of the brake band is released by varying resistance of the are andthe said pulley being adapted to rotate in the opposite direction underthe action of its internally arranged coiled band or tape to take up theslack ofthe carrier cord when said carrier is lifted, substantially asdescribed.

3. The combination with abalance or swing frame F and the link L, of abrake lever G fulcrumed to said frame at H for controlling the grip of awire or band D upon the brake wheel N under the combined radial movementof the frame F and connecting link L.

In witness whereof I have hereto signed my name in the presence of twosubscribing witnesses this 11th day of September, 1894-.

LOUIS Oi'lltli HENRY MENSING.

Witnesses:

A. E. PRIDHAM, W. F. HEWITT,

